util.jid+tests: Add simple helpers... node(), host() and resource() for extracting specific parts of a JID

tests/test_util_jid.lua

@@ -71,3 +71,73 @@ function compare(compare)
 	assert_equal(compare("user@other-host", "host"), false, "host should not match");
 	assert_equal(compare("user@other-host", "user@host"), false, "host should not match");
 end
+
+function node(node)
+	local function test(jid, expected_node)
+		assert_equal(node(jid), expected_node, "Unexpected node for "..tostring(jid));
+	end
+
+	test("example.com", nil);
+	test("foo.example.com", nil);
+	test("foo.example.com/resource", nil);
+	test("foo.example.com/some resource", nil);
+	test("foo.example.com/some@resource", nil);
+
+	test("foo@foo.example.com/some@resource", "foo");
+	test("foo@example/some@resource", "foo");
+
+	test("foo@example/@resource", "foo");
+	test("foo@example@resource", nil);
+	test("foo@example", "foo");
+	test("foo", nil);
+
+	test(nil, nil);
+end
+
+function host(host)
+	local function test(jid, expected_host)
+		assert_equal(host(jid), expected_host, "Unexpected host for "..tostring(jid));
+	end
+
+	test("example.com", "example.com");
+	test("foo.example.com", "foo.example.com");
+	test("foo.example.com/resource", "foo.example.com");
+	test("foo.example.com/some resource", "foo.example.com");
+	test("foo.example.com/some@resource", "foo.example.com");
+
+	test("foo@foo.example.com/some@resource", "foo.example.com");
+	test("foo@example/some@resource", "example");
+
+	test("foo@example/@resource", "example");
+	test("foo@example@resource", nil);
+	test("foo@example", "example");
+	test("foo", "foo");
+
+	test(nil, nil);
+end
+
+function resource(resource)
+	local function test(jid, expected_resource)
+		assert_equal(resource(jid), expected_resource, "Unexpected resource for "..tostring(jid));
+	end
+
+	test("example.com", nil);
+	test("foo.example.com", nil);
+	test("foo.example.com/resource", "resource");
+	test("foo.example.com/some resource", "some resource");
+	test("foo.example.com/some@resource", "some@resource");
+
+	test("foo@foo.example.com/some@resource", "some@resource");
+	test("foo@example/some@resource", "some@resource");
+
+	test("foo@example/@resource", "@resource");
+	test("foo@example@resource", nil);
+	test("foo@example", nil);
+	test("foo", nil);
+	test("/foo", nil);
+	test("@x/foo", nil);
+	test("@/foo", nil);
+
+	test(nil, nil);
+end
+

util/jid.lua

@@ -93,6 +93,18 @@ local function compare(jid, acl)
 	return false
 end
 
+local function node(jid)
+	return (select(1, split(jid)));
+end
+
+local function host(jid)
+	return (select(2, split(jid)));
+end
+
+local function resource(jid)
+	return (select(3, split(jid)));
+end
+
 local function escape(s) return s and (s:gsub(".", escapes)); end
 local function unescape(s) return s and (s:gsub("\\%x%x", unescapes)); end
 
@@ -103,6 +115,9 @@ return {
 	join = join;
 	prep = prep;
 	compare = compare;
+	node = node;
+	host = host;
+	resource = resource;
 	escape = escape;
 	unescape = unescape;
 };